Leviticus 13:47-52

47If any fabric is contaminated with mildew1—any wool or linen garment, 48any weave or knit of linen or wool, or any article of leather— 49and if the mark in the fabric, leather, weave, knit, or leather article is green or red, then it is contaminated with mildew and must be shown to the priest. 50And the priest is to examine the mildew and isolate the contaminated fabric for seven days.

51On the seventh day the priest shall reexamine it, and if the mildew has spread in the fabric, weave, knit, or leather, then regardless of how it is used, it is a harmful mildew; the article is unclean. 52He is to burn the fabric, weave, or knit, whether the contaminated item is wool or linen or leather. Since the mildew is harmful, the article must be burned up.